Comparison of extractive chemical signatures among branch, knot and bark wood fractions from forestry and agroforestry walnut trees (Juglans regia × J. nigra) by NIR spectroscopy and LC-MS analyses

Heim Lucie, Dodeler Roxane, Brancheriau Loïc, Marchal Rémy, Boutahar Nabila, Lotte Sylvain, Dumarçay Stéphane, Gérardin Philippe, Candelier Kévin. 2022. Comparison of extractive chemical signatures among branch, knot and bark wood fractions from forestry and agroforestry walnut trees (Juglans regia × J. nigra) by NIR spectroscopy and LC-MS analyses. Iforest, 15 (1) : 56-62.

Résumé : Walnut agroforestry systems require regular tree pruning, generating a large volume of biomass residues which are mainly valorized as wood-energy, Ramial Chipped Wood (RCW) or animal litter. However, walnut is recognized as a rich source of different chemical compounds, which could be recovered as valuable chemicals. This study aims to improve the knowledge on the composition of the water and ethanol extractive contents of wood, knot and bark fractions from walnut branches, harvested in agroforestry (AF) and traditional forestry control (FC) systems. LC-MS analyses were carried out to identify the chemical composition of extracts. Additionally, all samples were analyzed by near-infrared (NIR) spectroscopy with the aim of developing a fast tool to distinguish walnut branches, knots and bark wood fractions from trees grown under agroforestry and plantation management. Extractive contents and chemical composition of AF and FC wood samples were slightly different among branch, knot and bark. Despite these small chemical differences, PLS-DA models based on NIRS measurements can distinguishing among wood samples from walnut trees grown under different silvicultural regimes. In addition, in the both forestry systems, branch and knot extractive contents were significantly lower than those of bark specimens. Principal Component Analyses (PCA) based on NIR-spectrometry of raw samples revealed that the chemical composition of branch and knot woods are similar to each other and are very different compared to those of bark samples. This study provides new knowledge on branch woods from agroforestry systems, which are still very under-studied at present.

Mots-clés Agrovoc : Juglans regia, hybride, mode de culture, agroforesterie, écorce, branche, noeud, composition chimique, spectroscopie infrarouge, chromatographie

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Agroforestry, Bark, Branches, Extractives, Knot, Walnut

Classification Agris : F08 - Systèmes et modes de culture
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Heim Lucie, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Dodeler Roxane, Université de Montpellier (FRA)
• Brancheriau Loïc, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9580-7696
• Marchal Rémy, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Boutahar Nabila, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Lotte Sylvain, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Dumarçay Stéphane, Université de Lorraine (FRA)
• Gérardin Philippe, Université de Lorraine (FRA)
• Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/600251/)

Métriques

[ Page générée et mise en cache le 2024-01-29 ]